A compensation system and method involves configuring operating parameters for a RF communication circuit using primary calibration parameters and adjusting for time-varying performance of the RF communication circuit using secondary calibration parameters retrieved from a look-up table based on an environmental factor.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may transmit an insufficient calibration message based at least in part on a trigger condition that indicates that a calibration of the wireless communication device is insufficient. The wireless communication device may receive a set of signals associated with calibration assistance in response to the insufficient calibration message. Numerous other aspects are described.

A user equipment (UE) device may communicate with a wireless base station (BS). Each antenna in a phased antenna array on the UE may receive a reference signal transmitted by the BS during the beam training interval. Transceiver circuitry may measure wireless performance metric data from the reference signal. While receiving the reference signal, control circuitry may selectively activate different individual antennas, may selectively activate different subsets of antennas, or may concurrently activate all of the antennas in the array. The control circuitry may identify, based on the wireless performance metric data, a first set of the antennas in the array to that are being blocked by an external object and a second set of antennas array that are not blocked. After the beam training interval, the transceiver may use the second set of antennas to convey wireless data with the BS while the first set of antennas are disabled.

Methods and apparatus are provided. In an example aspect, a method in a first access point of transmitting a signal is provided. The method includes, for each of a plurality of User Equipments (UEs), determining a phase alignment correction factor (PACF) for the UE based on an access point group associated with the UE, and transmitting a respective first signal to the UE, wherein the first signal is phase adjusted using the PACF determined for the UE.

The apparatus may be a wireless device configured to transmit, for a network device, a first indication mapping each of a plurality of residual integrated phase noise powers (RIPNPs) to a corresponding number of subcarriers, receive, based on the first indication, a second indication of a number of subcarriers including a phase tracking reference signal (PTRS), receive, via one or more symbols, a transmission including a data signal and the PTRS over the number of subcarriers indicated in the second indication, and perform a demodulation of the data signal using a phase noise estimation based on the PTRS. The apparatus may be a network device configured to obtain, from a wireless device, the first indication, output, based on the first indication, the second indication, and transmit, via one or more symbols, the transmission including the data signal and the PTRS.

There is disclosed antenna circuitry for a radio node, the antenna circuitry being connected or connectable to, and/or included in, an antenna arrangement having a plurality of antenna subarrays, the antenna circuitry being adapted to connect each of a plurality of Digital-to-Analog Converters, DACs, and/or Analog-to Digital Converters, ADCs, to a different one of the plurality of antenna subarrays for signal transmission; The antenna circuitry has a calibration network, the calibration network being adapted to provide signalling from one or more of the DACs to one or more of the ADCs. The disclosure also pertains to related devices and methods.

The present disclosure provides a method for determining a target initial phase, including: acquiring a voltage amplitude of a system direct-current offset signal of a phased array system corresponding to N target channels to be calibrated; respectively acquiring voltage amplitudes of a total direct-current offset signal under different initial phases; and calculating voltage amplitudes of a mixed direct-current offset signal of the N target channels under the different initial phases, and taking an initial phase of the N target channels, when the voltage amplitude of the mixed direct-current offset signal reaches the maximum value, as a target initial phase of the N target channels. The present disclosure further provides a phase calibration method, an apparatus for determining an initial phase, and an antenna system.

OFDM-BPSK symbol sequences are used for mutual-coupling based phase array calibration. Such substitution allows phase to be estimated more accurately using a given estimation duration without compromising other estimates (amplitude and group delay) accuracies.

A method for determining phase information related to an RF transmission channel includes generating a frequency-modulated RF signal including a frequency ramp, coupling a first representation of the frequency-modulated RF signal to the RF transmission channel to generate a first frequency-modulated RF output signal, and coupling a second representation of the frequency-modulated RF signal to a test phase shifter. Measurement samples are generated during the frequency ramp based on phase shifting the second representation of the frequency-modulated RF signal according to a set of phase shift values to generate a frequency-modulated RF test signal, generating a down-converted signal based on mixing a first representation of the first frequency-modulated RF output signal with the frequency-modulated RF test signal, sampling the down-converted signal to generate, for each phase shift value, a respective measurement sample, and computing the phase information related to the RF transmission channel based on the measurement samples.

Wireless circuitry is provided that includes a radio-frequency circuit having an input transistor and bias point selection circuitry configured to determine an optimal bias voltage for the input transistor. The bias point selection circuitry may include a replica transistor, a voltage generator configured to output one or more voltage levels to a gate terminal of the replica transistor, a current-to-voltage converter coupled to a source-drain terminal of the replica transistor, an analog-to-digital converter configured to receive analog voltages from the current-to-voltage converter and to output corresponding digital codes based on the received analog voltages, and associated control circuitry configured to receive the digital codes from the analog-to-digital converter and to adjust the voltage generator to output the optimal bias voltage based on the digital codes. The optimal bias voltage produces a third order transconductance of zero for the input transistor, which results in improved linearity for the radio-frequency circuit.